FX.co ★ US 4-Week T-Bill Auction Yield Edges Up to 3.660%

The yield on the latest US 4-week Treasury bill auction inched higher, with the rate closing at 3.660%, up from the previous 3.630%. The move, while modest, reflects a slight tightening in very short-term borrowing costs for the US government.

The updated figure, reported on 16 July 2026, suggests continued investor demand for short-dated US government debt, with yields adjusting upward at the margin. The 4-week bill is closely watched as a barometer of near-term funding conditions and risk sentiment in the money markets.

Although the increase of 0.030 percentage points is relatively small, it underscores the sensitivity of short-term rates to evolving expectations around liquidity, monetary conditions, and the broader economic backdrop in the United States.